docs: fix links
Travis: allow doc warning until merging docs is complete
Makefile: add pep8 command
Travis: bump Django to 1.6.5 add 1.7.1
Tavis: disable migration testing

Bring this back once we have a migration path from older versions.
Travis: Django 1.7.1 can't run on Python 2.6
Travis: port travis specific config to core
Travis: force MyISAM

At least until we close #3363 and #3364
requirments: ensure pyDes installs